Department of Economics / Institutionen för nationalekonomi med statistik: Recent submissions

Visas titlar 461-480 av 1135

    • The effect of non-normal error terms on the properties of systemwise RESET test 

      Shukur, Ghazi (University of Gothenburg, 1999-06-01)
      The small sample properties of the systemwise RESET test for functional misspecification is investigated using normal and non-normal error terms. When using normally distributed or less heavy tailed error terms, we find ...

    • Some power aspects of methods for detecting different shifts in the mean 

      Järpe, Erik; Wessman, Peter (University of Gothenburg, 1999-07-01)
      We study, by means of simulations, the performance of the Shewhart method, the Cusum method, the Shiryaev-Roberts method and the likelihood ratio method in the case when the true shift differs from the shift for which the ...

    • On statistics and scientific thinking 

      Johnsson, Tommy (University of Gothenburg, 1999-08-01)
      Scientific thinking could in a wider scope be regarded as the process resulting in scientific knowledge. Such a definition is however at the same time to narrow and to wide since you could easily find projects ruled by the ...

    • Trend-free repeated measurement designs 

      Afsarinejad, Kasra (University of Gothenburg, 1999-09-01)
      The existence and non-existence of trend-free repeated measurement designs are investigated. Two families of efficient / optimal trend-free repeated measurement designs have been identified and methods of construction of ...

    • The impact of season and climate on growth during early childhood in different socio-economic groups in Lahore, Pakistan 

      Carlquist, Anders; Erling, Valdemar; Ashraf, Rifat; Frisen, Frisen; Hanson, Lars Å; Jalil, Fehmida; Zaman, Shakila (University of Gothenburg, 1999-10-01)
      Aim. The aim of this study was to analyse the impact of season and climate on early child growth in four socio-economically different groups living in Lahore, Pakistan. Methods. A prospective cohort study was conducted ...

    • Longitudinal methods for analysis of the influence of breastfeeding on early child health in Pakistan 

      Carlquist, Anders; Erling, Valdemar; Frisén, Marianne (University of Gothenburg, 1999-11-01)
      Statistical methods for analysing aspects of early child health in Lahore, Pakistan are discussed. We construct generalised linear mixed models with a binomial response variable and both fixed and random explaining effects. ...

    • Longitudinal methods for analysis of early child health in Pakistan 

      Carlquist, Anders (University of Gothenburg, 1999-12-01)
      Statistical methods to analyse some aspects on early child health in Lahore, Pakistan are discussed. The aim of this thesis is to choose, examine and use statistical methods suitable to analyse different aspects of early ...

    • Characterization of methods for surveillance by optimality 

      Frisén, Marianne (University of Gothenburg, 1999-12-02)
      Different criteria of optimality are discussed. The shortcomings of some criteria of optimality are demonstrated by their implications. The correspondences between some criteria of optimality and some methods are examined. ...

    • Multivariate based causality tests of twin deficits in the US 

      Hatemi-J, Abdulnasser; Shukur, Ghazi (University of Gothenburg, 2000-01-01)
      This paper provides an alternative methodology for testing the causality direction between Twin deficits in the US. Rao' s multivariate F -test combined with bootstraps simulation technique has appealing properties, ...

    • Aspects on tolerance limit estimation - some common approaches and flexible modeling 

      Petzold, Max (University of Gothenburg, 2000-02-01)
      In a dose finding study the aim is to attain a safe and efficient drug therapy in a certain population. By a dose finding study we generally refer to a study where the dosage is successively adjusted after analyzing the ...

    • Statistical test of the existence of a turning point 

      Andersson, Lennart (University of Gothenburg, 2000-03-01)
      A method for testing monotonicity versus unimodality is presented. One specification of the problem is treated in detail. It is also discussed how transformations and combinations can be used to get solutions for other ...

    • Some aspects of wavelet anal ysis in time series 

      Almasri, Abdullah (University of Gothenburg, 2000-04-01)
      The first paper describes an alternative approach for testing the existence of trend among time series. The test method has been constructed using wavelet analysis which have the ability to decompose a time series into low ...

    • Surveillance of spatio-temporal patterns - Change of interaction in an Ising dynamic model 

      Järpe, Eric (University of Gothenburg, 2000-05-01)
      Surveillance to detect changes of spatial patterns is of interest in many areas such as environmental control and regional analysis. A model which possesses both spatial and time dependence is the Markov chain Markov field. ...

    • Detection of environmental catastrophes 

      Järpe, Eric (University of Gothenburg, 2000-06-01)
      For on-line detection of environmental catastrophes spatial as well as temporal effects are crucial. Observations of some substance are made at different locations in space at discrete times. Mainly two spatial features ...

    • Statistical surveillance - Exponentially weighted moving average methods and public health monitoring 

      Sonesson, Christian (University of Gothenburg, 2001-07-01)
      The need for statistical surveillance has been noticed in many different areas and examples of applications include the detection of an increased incidence of a disease, the detection of an increased radiation level and ...

    • Evaluations of some exponentially weighted moving average methods 

      Sonesson, Christian (University of Gothenburg, 2001-06-01)
      Several versions of the EWMA (Exponentially Weighted Moving Average) method for monitoring a process with the aim of detecting a shift in the mean are studied both for the onesided and the two-sided case. The effects of ...

    • Likelihood based methods for detection of turning points in business cycles - A comparative study 

      Andersson, Eva; Bock, David; Frisén, Marianne (University of Gothenburg, 2001-05-01)
      Methods for on-line monitoring of business cycles are compared with respect to the ability of early prediction of the next tum by an alarm for a tum in a leading index. Three likelihood-based methods for turning point ...

    • On seasonal filters and monotonicity 

      Andersson, Eva; Bock, David (University of Gothenburg, 2001-04-01)
      Seasonal adjustment is important in for example economic time series where the variation can be due to both seasonal and cyclical movements. In a situation where we want to detect a turning point of a cyclical process ...

    • Turning point detection using non-parametric statistical surveillance 

      Andersson, Eva (University of Gothenburg, 2001-03-01)
      Turning point detection is important in many areas. One application is forecasting the time of the next tum in the business cycle, by detection of a tum in leading economic indicators. Another application is detection of ...

    • Statistical issues in public health monitoring - A review and discussion 

      Sonesson, Christian; Bock, David (University of Gothenburg, 2001-02-01)
      A review of methods, suggested in the literature, for sequential detection of changes in public health surveillance data is presented. Many authors have noticed the need for prospective methods and there has been an increased ...